Camera optical lens

ABSTRACT

The present disclosure discloses a camera optical lens including eight lenses which are, from an object-side to an-image side: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power and an eight lens having a negative refractive power, which satisfies following conditions: 0.95≤f/TTL; −3.50≤f2/f≤−1.80; and 3.00≤(R9+R10)/(R9−R10)≤30.00; where f denotes a focal length of the camera optical lens. The camera optical lens can achieve good optical performance while meeting the design requirement for large aperture, long focal length and ultra-thinness (in a camera optical lens with the long focal length).

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, in particular to a camera optical lens suitable for handheld devices, such as smart phones and digital cameras, and imaging devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lens with good imaging quality therefore have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece, four-piece, or even five-piece or six-piece lens structure. However, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the camera optical lens on the imaging quality is improving constantly, the eight-piece lens structure gradually appears in lens designs. Although the typical eight-piece lens already has good optical performance, its optical power, lens spacing and lens shape remain unreasonable to some extents, resulting in that the lens structure, which, even though, has excellent optical performance, is not able to meet the design requirement for large aperture, ultra-thinness and long focal length.

SUMMARY

A camera optical lens is provided, including eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies following conditions: 0.95≤f/TTL; −3.50≤f2/f≤−1.80; and 3.00≤(R9+R10)/(R9−R10)≤30.00; where f denotes a focal length of the camera optical lens; TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f2 denotes a focal length of the second lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; and R10 denotes a central curvature radius of an image-side surface of the fifth lens.

As an improvement, the camera optical lens further satisfies the following condition: 1.50≤d10/d9≤3.00; where d9 denotes an on-axis thickness of the fifth lens; and d10 denotes an on-axis distance from an image-side surface of the fifth lens to an object-side surface of the sixth lens.

As an improvement, the camera optical lens further satisfies following conditions: 0.70≤f1/f≤2.49; −10.16≤(R1+R2)/(R1−R2)≤−2.83; and 0.05≤d1/TTL≤0.15; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.

As an improvement, the camera optical lens further satisfies following conditions: 3.00≤(R3+R4)/(R3−R4)≤17.99; and 0.02≤d3/TTL≤0.05; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.

As an improvement, the camera optical lens further satisfies following conditions: 0.55≤f3/f≤1.74; −3.42≤(R5+R6)/(R5−R6)≤−0.96; and 0.05≤d5/TTL≤0.19; where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.

As an improvement, wherein the camera optical lens further satisfies following conditions: 2.50≤f4/f≤26.48; −201.36≤(R7+R8)/(R7−R8)≤−15.55; and 0.02≤d7/TTL≤0.05; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.

As an improvement, the camera optical lens further satisfies following conditions: −67.69≤f5/f≤−2.89; and 0.02≤d9/TTL≤0.06; where f5 denotes a focal length of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.

As an improvement, the camera optical lens further satisfies following conditions: 1.69≤f6/f≤12.93; 1.49≤(R11+R12)/(R11−R12)≤9.80; and 0.03≤d11/TTL≤0.08; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.

As an improvement, the camera optical lens further satisfies following conditions: −5.36≤f7/f≤−1.50; 1.81≤(R13+R14)/(R13-R14)≤7.10; and 0.03≤d13/TTL≤0.08; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.

As an improvement, the camera optical lens further satisfies following conditions: −3.05≤f8/f≤−0.96; −2.52≤(R15+R16)/(R15−R16)≤−0.58; and 0.03≤d15/TTL≤0.09; where f8 denotes a focal length of the eighth lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate the technical solutions according to the embodiments of the present disclosure or in the prior art more clearly, the accompanying drawings for describing the embodiments or the prior art are introduced briefly in the following. Apparently, the accompanying drawings in the following description are only some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1.

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1.

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1.

FIG. 5 is a schematic diagram of a structure of a camera optical lens according to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5.

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5.

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5.

FIG. 9 is a schematic diagram of a structure of a camera optical lens according to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9.

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9.

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DETAILED DESCRIPTION OF EMBODIMENTS

To make the objects, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides a camera optical lens 10. FIG. 1 shows a camera optical lens 10 provided in Embodiment 1 of the present disclosure, and the camera optical lens 10 includes eight lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8. An optical element such as an optical filter GF can be arranged between the eighth lens L8 and an image surface Si.

In this embodiment, the first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a positive refractive power, the seventh lens L7 has a negative refractive power and the eighth lens L8 has a negative refractive power. In this embodiment, the first lens L1 has a positive refractive power, which facilitates improvement of optical performance of the camera optical lens. In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are made of plastic material. In other embodiments, the lenses may be made of other material.

In this embodiment, a focal length of the camera optical lens 10 is defined as f, a total optical length from an object-side surface of the first lens L1 to an image surface Si of the camera optical lens 10 along an optical axis is defined as TTL. The camera optical lens 10 satisfies following conditions: 0.95≤f/TTL, which specifies a ratio of the focal length f of the camera optical lens 10 and the total optical length TTL from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis. Given the same optical length, the camera optical lens 10 has a longer focal length.

A focal length of the second lens L2 is defined as f2. The camera optical lens 10 satisfies following conditions: −3.50≤f2/f≤−1.80, which specifies a ratio of the focal length f2 of the second lens L2 and the focal length f of the camera optical lens 10. Within this range, it is beneficial for correcting aberration of the camera optical lens and improving imaging quality.

A central curvature radius of an object-side surface of the fifth lens L5 is defined as R9, and a central curvature radius of an image-side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 satisfies following conditions: 3.00≤(R9+R10)/(R9−R10)≤30.00, which specifies a shape of the fifth lens L5. Within this range, a deflection degree of lights passing through the lens can be alleviated, and the aberration can be effectively reduced.

An on-axis thickness of the fifth lens L5 is defined as d9, and an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6 is defined as d10. The camera optical lens 10 satisfies the following condition: 1.50≤d10/d9≤3.00. Within this range, it is beneficial for manufacturing of the lenses and assembly of the camera optical lens. Preferably, the camera optical lens 10 satisfies the following condition: 1.74≤d10/d9≤2.85.

In this embodiment, the first lens L1 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

A focal length of the first lens L1 is defined as f1. The camera optical lens 10 satisfies the following condition: 0.70≤f1/f≤2.49, which specifies a ratio of the focal length f1 of the first lens L1 to the focal length f of the camera optical lens 10. Within this range, the first lens L1 has an appropriate positive refractive power, which is beneficial for reducing the aberration of the camera optical lens and a development of the lenses towards ultra-thinness. Preferably, the camera optical lens 10 satisfies the following condition: 1.13≤f1/f≤1.99.

A central curvature radius of the object-side surface of the first lens L1 is defined as R1, and a central curvature radius of an image-side surface of the first lens L1 is defined as R2. The camera optical lens 10 satisfies the following condition: −10.16≤(R1+R2)/(R1−R2)≤−2.83. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct the spherical aberration of the camera optical lens. Preferably, the camera optical lens 10 satisfies the following condition: −6.35≤(R1+R2)/(R1−R2)≤−3.54.

An on-axis thickness of the first lens L1 is defined as d1, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.05≤d1/TTL≤0.15. Within this range, it is beneficial for realization of ultra-thin lenses. This can facilitate achieving ultra-thinness of the lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.07≤d1/TTL≤0.12.

In this embodiment, the second lens L2 includes an object-side surface being convex in the paraxial region and an image-side surface being concave in the paraxial region.

A central curvature radius of an object-side surface of the second lens L2 is defined as R3, and a central curvature radius of an image-side surface of the second lens L2 is defined as R4. The camera optical lens 10 satisfies the following condition: 3.00≤(R3+R4)/(R3−R4)≤17.99, which specifies a shape of the second lens L2. Within this range, a development of the lenses towards ultra-thinness would facilitate correcting an on-axis chromatic aberration. Preferably, the camera optical lens 10 satisfies the following condition: 4.80≤(R3+R4)/(R3−R4)≤14.39.

An on-axis thickness of the second lens L2 is defined as d3, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d3/TTL≤0.05. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d3/TTL≤0.04.

In this embodiment, the third lens L3 includes an object-side surface being convex in the paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the third lens L3 is defined as f3. The camera optical lens 10 satisfies the following condition: 0.55≤f3/f≤1.74. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 0.88≤f3/f≤1.39.

A central curvature radius of an object-side surface of the third lens L3 is defined as R5, a central curvature radius of an image-side surface of the third lens L3 is defined as R6. The camera optical lens 10 satisfies the following condition: −3.42≤(R5+R6)/(R5−R6)≤−0.96, which specifies a shape of the third lens L3. Within this range, a deflection degree of lights passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies the following condition: −2.14≤(R5+R6)/(R5−R6)≤−1.20.

The on-axis thickness of the third lens L3 is defined as d5, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.05≤d5/TTL≤0.19. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.08≤d5/TTL≤0.15.

In this embodiment, the fourth lens L4 includes an object-side surface being convex in the paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fourth lens L4 is defined as f4. The camera optical lens 10 satisfies the following condition: 2.50≤f4/f≤26.48. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 4.00≤f4/f≤21.18.

A central curvature radius of the object-side surface of the fourth lens L4 is defined as R7, and a central curvature radius of an image-side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 satisfies the following condition: −201.36≤(R7+R8)/(R7−R8)≤−15.55, which specifies a shape of the fourth lens L4. Within this range, the development of the lenses towards ultra-thinness would facilitate correcting an off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −125.85≤(R7+R8)/(R7−R8)≤−19.43.

An on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d7/TTL≤0.05. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d7/TTL≤0.04.

In this embodiment, the fifth lens L5 includes an object-side surface being convex in the paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fifth lens L5 is defined as f5. The camera optical lens 10 satisfies the following condition: −67.69≤f5/f≤−2.89, which can effectively make a light angle of the camera lens gentle and reduce tolerance sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −42.30≤f5/f≤−3.62.

An on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d9/TTL≤0.06. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d9/TTL≤0.05.

In this embodiment, the sixth lens L6 includes an object-side surface being concave in the paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the sixth lens L6 is defined as f6. The camera optical lens 10 satisfies the following condition: 1.69≤f6/f≤12.93. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 2.71≤f6/f≤10.34.

A central curvature radius of an object-side surface of the sixth lens L6 is defined as R11, and a central curvature radius of an image-side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 satisfies the following condition: 1.49≤(R11+R12)/(R11−R12)≤9.80, which specifies a shape of the sixth lens L6. Within this range, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: 2.39≤(R11+R12)/(R11−R12)≤7.84.

An on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d11/TTL≤0.08. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.04≤d11/TTL≤0.07.

In this embodiment, the seventh lens L7 includes an object-side surface being convex in the paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the seventh lens L7 is defined as f7. The camera optical lens 10 satisfies the following condition: −5.36≤f7/f≤−1.50. Within this range, with reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −3.35≤f7/f≤−1.88.

A central curvature radius of an object-side surface of the seventh lens L7 is defined as R13, and a central curvature radius of an image-side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 satisfies the following condition: 1.81≤(R13+R14)/(R13−R14)≤7.10, which specifies a shape of the seventh lens L7. Within this range, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: 2.89≤(R13+R14)/(R13−R14)≤5.68.

An on-axis thickness of the seventh lens L7 is defined as d13, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d13/TTL≤0.08. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.04≤d13/TTL≤0.07.

In this embodiment, the eighth lens L8 includes an object-side surface being concave in the paraxial region and an image-side surface being convex in the paraxial region. It should be appreciated that, in other embodiments, configuration of object-side surfaces and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have a distribution in convex and concave other than that of the above-described embodiment.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the eighth lens L8 is defined as f8. The camera optical lens 10 satisfies the following condition: −3.05≤f8/f≤−0.96. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −1.91≤f8/f≤−1.20.

A central curvature radius of an object-side surface of the eighth lens L8 is defined as R15, and a central curvature radius of an image-side surface of the eighth lens L8 is defined as R16. The camera optical lens 10 satisfies the following condition: −2.52≤(R15+R16)/(R15−R16)≤−0.58, which specifies a shape of the eighth lens L8. Within this range, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −1.58≤(R15+R16)/(R15−R16)≤−0.72.

An on-axis thickness of the eighth lens L8 is defined as d15, and the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d15/TTL≤0.09. Within this range, it is beneficial for realization of ultra-thin lenses. Preferably, the camera optical lens 10 satisfies the following condition: 0.04≤d15/TTL≤0.07.

In an embodiment, an image height of the camera optical lens 10 is defined as IH, the total optical length from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens 10 along the optical axis is defined as TTL. The camera optical lens 10 satisfies the following condition: TTL/IH≤2.30, which is for realization of ultra-thin lenses.

In an embodiment, an F number of the camera optical lens 10 is less than or equal to 1.92, thus achieving large aperture and better imaging performance of the camera optical lens 10.

In this embodiment, the focal length of the camera optical lens 10 is defined as f, and the image height of the camera optical lens 10 is defined as IH. The camera optical lens 10 satisfies the following condition: f/IH≥2.25, which makes the camera optical lens have a long focal length.

When the above conditions are satisfied, the camera optical lens 10 meets the design requirement for large aperture, long focal length and ultra-thinness (in a camera optical lens with the long focal length) while having excellent optical imaging performance. Based on the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly applicable to mobile camera lens assemblies and WEB camera lenses composed of such camera elements as CCD and CMOS for high pixels.

The camera optical lens 10 will be further described with reference to the following examples. Symbols used in various examples are shown as follows. The focal length, on-axis distance, central curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Total optical length (the distance from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens along the optical axis) in mm.

FNO: Ratio of an effective focal length and an entrance pupil diameter of the camera optical lens.

Preferably, inflexion points and/or arrest points can be arranged on the object-side surface and/or the image-side surface of each lens, so as to satisfy the demand for high quality imaging. The description below can be referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd vd S1 ∞ d0= −1.023 R1 3.206 d1= 0.855 nd1 1.5444 v1 55.82 R2 4.778 d2= 0.052 R3 2.761 d3= 0.300 nd2 1.6800 v2 18.40 R4 2.336 d4= 0.114 R5 4.511 d5= 1.144 nd3 1.5444 v3 55.82 R6 24.831 d6= 0.164 R7 4.984 d7= 0.322 nd4 1.6800 v4 18.40 R8 5.084 d8= 0.841 R9 24.491 d9= 0.380 nd5 1.6800 v5 18.40 R10 12.736 d10= 0.752 R11 −19.830 d11= 0.500 nd6 1.6800 v6 18.40 R12 −10.294 d12= 0.369 R13 8.035 d13= 0.507 nd7 1.5444 v7 55.82 R14 4.554 d14= 1.332 R15 −6.262 d15= 0.507 nd8 1.5444 v8 55.82 R16 −54.159 d16= 0.400 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18= 0.390

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: a central curvature radius of an optical surface;

R1: central curvature radius of the object-side surface of the first lens L1;

R2: central curvature radius of the image-side surface of the first lens L1;

R3: central curvature radius of the object-side surface of the second lens L2;

R4: central curvature radius of the image-side surface of the second lens L2;

R5: central curvature radius of the object-side surface of the third lens L3;

R6: central curvature radius of the image-side surface of the third lens L3;

R7: central curvature radius of the object-side surface of the fourth lens L4;

R8: central curvature radius of the image-side surface of the fourth lens L4;

R9: central curvature radius of the object-side surface of the fifth lens L5;

R10: central curvature radius of the image-side surface of the fifth lens L5;

R11: central curvature radius of the object-side surface of the sixth lens L6;

R12: central curvature radius of the image-side surface of the sixth lens L6;

R13: central curvature radius of the object-side surface of the seventh lens L7;

R14: central curvature radius of the image-side surface of the seventh lens L7;

R15: central curvature radius of an object-side surface of the eighth lens L8;

R16: central curvature radius of an image-side surface of the eighth lens L8;

R17: central curvature radius of an object-side surface of the optical filter GF;

R18: central curvature radius of an image-side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object-side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the six lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image-side surface of the optical filter GF to the image surface Si;

nd: refractive index of a d line;

nd1: refractive index of a d line of the first lens L1;

nd2: refractive index of a d line of the second lens L2;

nd3: refractive index of a d line of the third lens L3;

nd4: refractive index of a d line of the fourth lens L4;

nd5: refractive index of a d line of the fifth lens L5;

nd6: refractive index of a d line of the sixth lens L6;

nd7: refractive index of a d line of the seventh lens L7;

nd8: refractive index of a d line of the eighth lens L8;

ndg: refractive index of a d line of the optical filter GF;

νd: abbe number;

ν1: abbe number of the first lens L1;

ν2: abbe number of the second lens L2;

ν3: abbe number of the third lens L3;

ν4: abbe number of the fourth lens L4;

ν5: abbe number of the fifth lens L5;

ν6: abbe number of the sixth lens L6;

ν7: abbe number of the seventh lens L7;

ν8: abbe number of the eighth lens L8;

νg: abbe number of the optical filter GF.

Table 2 shows aspherical surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −1.2086E−01  1.1593E−03  9.7283E−04 4.5026E−04 −1.0841E−03 6.5748E−04 R2  2.8533E+00 −6.8101E−02  8.4704E−02 −5.5922E−02   2.0524E−02 −3.6117E−03  R3 −9.9940E+00 −1.6519E−02 −1.8343E−02 4.5549E−02 −3.7554E−02 1.7230E−02 R4 −7.3056E+00  9.4880E−02 −1.5629E−01 1.0176E−01 −1.9923E−02 −9.3273E−03  R5  2.7231E+00  7.6779E−02 −9.8940E−02 2.7784E−02  3.1499E−02 −3.1039E−02  R6  8.7796E+00  8.2664E−03 −1.6458E−02 1.6415E−02 −5.2536E−03 −1.0392E−03  R7 −2.0746E+01 −1.6326E−02 −1.1757E−02 2.1971E−02 −1.1199E−02 1.3475E−03 R8 −1.3581E+01 −2.9663E−02  5.0123E−03 8.4511E−03 −6.1042E−03 1.0697E−03 R9 −2.0038E+01 −2.9654E−02  7.0306E−03 6.0530E−03 −5.8122E−03 2.3036E−03 R10 −3.1437E+00 −2.9210E−02  4.6058E−03 7.2710E−03 −7.0093E−03 3.3953E−03 R11  8.2105E+00 −4.1289E−03 −1.1792E−02 2.0040E−03  3.1176E−03 −3.7660E−03  R12 −6.8897E+00 −1.7775E−03 −1.2024E−02 6.4890E−03 −2.1223E−03 2.1651E−04 R13 −5.1327E+00 −6.2486E−02 −2.6149E−03 9.1246E−03 −6.1863E−03 2.7918E−03 R14 −8.3693E+00 −5.0491E−02  4.9865E−03 1.5984E−03 −1.1989E−03 3.9907E−04 R15 −2.8135E−01 −2.0511E−02  3.9654E−03 −1.0332E−03   2.3578E−04 −1.5251E−05  R16 −3.0000E+01 −2.7500E−02  4.7835E−03 −9.6947E−04   1.9577E−04 −2.4993E−05  Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −1.2086E−01 −2.0337E−04 3.4768E−05 −3.1172E−06 1.1386E−07 R2  2.8533E+00 −7.8703E−05 1.5399E−04 −2.5096E−05 1.3456E−06 R3 −9.9940E+00 −4.8187E−03 8.1917E−04 −7.7849E−05 3.1661E−06 R4 −7.3056E+00  6.4960E−03 −1.6147E−03   1.8994E−04 −8.8008E−06  R5  2.7231E+00  1.2207E−02 −2.5328E−03   2.7290E−04 −1.2055E−05  R6  8.7796E+00  1.1854E−03 −3.3235E−04   4.1066E−05 −1.9185E−06  R7 −2.0746E+01  7.1940E−04 −3.0384E−04   4.5042E−05 −2.4272E−06  R8 −1.3581E+01  2.8857E−04 −1.5557E−04   2.5277E−05 −1.4661E−06  R9 −2.0038E+01 −5.5316E−04 7.8349E−05 −5.2311E−06 0.0000E+00 R10 −3.1437E+00 −1.1291E−03 2.5178E−04 −3.3440E−05 1.9616E−06 R11  8.2105E+00  1.9185E−03 −5.5209E−04   8.4812E−05 −5.2296E−06  R12 −6.8897E+00  8.4148E−05 −3.8258E−05   6.5855E−06 −4.1844E−07  R13 −5.1327E+00 −8.4945E−04 1.6304E−04 −1.7810E−05 8.4571E−07 R14 −8.3693E+00 −7.7218E−05 8.6720E−06 −5.2331E−07 1.3267E−08 R15 −2.8135E−01 −3.0704E−06 6.0102E−07 −3.8255E−08 8.5920E−10 R16 −3.0000E+01  1.4715E−06 6.4911E−09 −5.1869E−09 1.8769E−10

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.

y=(x ² /R)/{1+[1−(k+1(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (1)

Herein, x denotes a vertical distance between a point in an aspheric curve and the optical axis, and y denotes an aspheric depth (i.e. a vertical distance between the point having a distance of x from the optical axis and a plane tangent to a vertex on the optical axis of an aspheric surface).

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above condition (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the condition (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of each lens of the camera optical lens 10 in Embodiment 1 of the present disclosure. Herein, P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 1 2.325 / / P1R2 2 2.085 2.295 / P2R1 2 2.105 2.265 / P2R2 0 / / / P3R1 3 2.005 2.075 2.185 P3R2 2 1.745 2.155 / P4R1 2 1.065 2.055 / P4R2 1 0.925 / / P5R1 1 0.355 / / P5R2 1 0.515 / / P6R1 1 1.935 / / P6R2 1 1.975 / / P7R1 2 0.405 2.195 / P7R2 2 0.585 2.525 / P8R1 1 2.735 / / P8R2 1 3.275 / /

TABLE 4 Number(s) of arrest points Arrest point position 1 P1R1 0 / P1R2 0 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 1 2.025 P4R1 1 1.605 P4R2 1 1.575 P5R1 1 0.655 P5R2 1 1.075 P6R1 0 / P6R2 0 / P7R1 1 0.705 P7R2 1 1.065 P8R1 1 3.315 P8R2 0 /

FIG. 2 and FIG. 3 show a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 10 in Embodiment 1. FIG. 4 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 10 in Embodiment 1. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

Table 13 in the following shows various values of Embodiments 1, 2 and 3 and values corresponding to the parameters specified in the above conditions.

As shown in Table 13, Embodiment 1 satisfies the various conditions.

In this Embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 10 is 4.712 mm, an image height (IH) of 1.0H is 4.000 mm, and a field of view (FOV) in a diagonal direction is 47.50°. Thus, the camera optical lens 10 meets the design requirement for large aperture, long focal length and ultra-thinness. Its on-axis and off-axis chromatic aberrations are sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1, and the meaning of its symbols is the same as that of Embodiment 1. In the following, only differences are described.

FIG. 5 shows a camera optical lens 20 in Embodiment 2 of the present disclosure.

Table 5 and Table 6 show design data of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞ d0= −1.010 R1 3.158 d1= 0.899 nd1 1.5444 v1 55.82 R2 4.874 d2= 0.064 R3 3.343 d3= 0.304 nd2 1.6800 v2 18.40 R4 2.628 d4= 0.090 R5 4.398 d5= 1.013 nd3 1.5444 v3 55.82 R6 18.630 d6= 0.153 R7 4.070 d7= 0.320 nd4 1.6800 v4 18.40 R8 4.173 d8= 0.772 R9 11.764 d9= 0.380 nd5 1.6800 v5 18.40 R10 10.993 d10= 1.003 R11 −20.051 d11= 0.500 nd6 1.6800 v6 18.40 R12 −14.726 d12= 0.431 R13 6.983 d13= 0.500 nd7 1.5444 v7 55.82 R14 4.368 d14= 1.188 R15 −6.853 d15= 0.514 nd8 1.5444 v8 55.82 R16 −182.146 d16= 0.400 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18= 0.399

Table 6 shows aspherical surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −1.9336E−01  8.3905E−04 −3.5075E−04 1.5309E−03 −1.4704E−03 6.9960E−04 R2  2.8675E+00 −4.6170E−02  3.7896E−02 −1.6651E−03  −1.8484E−02 1.3990E−02 R3 −9.9952E+00 −2.3940E−02 −1.2185E−02 4.8607E−02 −4.6248E−02 2.3550E−02 R4 −7.3008E+00  7.0148E−02 −9.8098E−02 3.5781E−02  2.3477E−02 −2.6541E−02  R5  2.5889E+00  7.0856E−02 −7.7928E−02 −4.1514E−03   5.7721E−02 −4.3637E−02  R6  9.7029E+00  3.5965E−03 −5.0705E−03 4.8035E−03  1.8614E−03 −3.9335E−03  R7 −1.7420E+01 −1.3254E−02 −8.8105E−03 1.6766E−02 −9.1037E−03 1.2737E−03 R8 −1.2808E+01 −2.5220E−02  1.8636E−03 1.0615E−02 −9.4270E−03 3.7996E−03 R9 −9.2892E+00 −2.4151E−02  5.4971E−03 1.8435E−03 −1.5768E−03 4.0569E−04 R10 −7.2000E−01 −2.3956E−02  4.2795E−03 1.8328E−03 −1.7316E−03 6.4011E−04 R11  8.3630E+00 −8.6349E−03 −1.1804E−02 9.5644E−03 −8.1110E−03 4.6476E−03 R12 −1.3205E+00 −7.1953E−03 −1.0735E−02 1.0456E−02 −7.1599E−03 3.2421E−03 R13 −3.1069E+00 −5.7983E−02 −7.9498E−03 1.3410E−02 −8.1765E−03 3.1393E−03 R14 −6.6805E+00 −4.5064E−02 −2.0427E−03 6.1499E−03 −3.2003E−03 9.7673E−04 R15  4.2663E−01 −1.8486E−02  1.4890E−03 −2.7652E−04   1.8831E−04 −3.1445E−05  R16 −3.0000E+01 −2.6567E−02  2.8881E−03 −3.0504E−04   9.8923E−05 −1.8235E−05  Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −1.9336E−01 −1.9095E−04 3.0158E−05 −2.5613E−06 9.0539E−08 R2  2.8675E+00 −5.0228E−03 9.8886E−04 −1.0246E−04 4.3669E−06 R3 −9.9952E+00 −7.1164E−03 1.2740E−03 −1.2466E−04 5.1296E−06 R4 −7.3008E+00  1.0625E−02 −2.1944E−03   2.3323E−04 −1.0109E−05  R5  2.5889E+00  1.5832E−02 −3.1492E−03   3.3031E−04 −1.4332E−05  R6  9.7029E+00  1.9789E−03 −4.7107E−04   5.4749E−05 −2.4910E−06  R7 −1.7420E+01  5.8561E−04 −2.7204E−04   4.2354E−05 −2.3562E−06  R8 −1.2808E+01 −8.2692E−04 8.8281E−05 −2.3972E−06 −1.7544E−07  R9 −9.2892E+00 −5.5730E−05 2.5472E−06  2.3254E−08 0.0000E+00 R10 −7.2000E−01 −1.6688E−04 2.8307E−05 −2.8576E−06 1.3934E−07 R11  8.3630E+00 −1.7571E−03 4.0334E−04 −5.1519E−05 2.9072E−06 R12 −1.3205E+00 −9.5620E−04 1.7275E−04 −1.7046E−05 7.0394E−07 R13 −3.1069E+00 −7.7048E−04 1.1374E−04 −9.0959E−06 3.0536E−07 R14 −6.6805E+00 −1.8487E−04 2.0998E−05 −1.3012E−06 3.3813E−08 R15  4.2663E−01  4.2563E−07 3.1559E−07 −2.7526E−08 7.0610E−10 R16 −3.0000E+01  1.1997E−06 2.4247E−08 −6.6001E−09 2.2975E−10

Table 7 and table 8 show design data of inflexion points and arrest points of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 7 Number(s) of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 0 / / / P1R2 2 2.105 2.285 / P2R1 2 2.115 2.275 / P2R2 3 2.005 2.105 2.205 P3R1 1 1.995 / / P3R2 2 1.785 2.165 / P4R1 2 1.035 2.075 / P4R2 1 0.925 / / P5R1 1 0.615 / / P5R2 1 0.635 / / P6R1 1 1.965 / / P6R2 1 2.015 / / P7R1 2 0.445 2.215 / P7R2 2 0.615 2.475 / P8R1 1 2.775 / / P8R2 1 3.315 / /

TABLE 8 Number(s) of arrest points Arrest point position 1 P1R1 0 / P1R2 0 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 1 2.065 P4R1 1 1.685 P4R2 1 1.645 P5R1 1 1.365 P5R2 1 1.285 P6R1 0 / P6R2 0 / P7R1 1 0.775 P7R2 1 1.105 P8R1 0 / P8R2 0 /

FIG. 6 and FIG. 7 show a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 20 in Embodiment 2. FIG. 8 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 20 in Embodiment 2. A field curvature S in FIG. 8 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

As shown in Table 13, Embodiment 2 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 20 is 4.712 mm, an image height (IH) of 1.0H is 4.000 mm, and a field of view (FOV) in a diagonal direction is 47.30°. Thus, the camera optical lens 20 meets the design requirement for large aperture, long focal length and ultra-thinness. Its on-axis and off-axis chromatic aberrations are sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1, and the meaning of its symbols is the same as that of Embodiment 1. In the following, only differences are described.

FIG. 9 shows a camera optical lens 30 in Embodiment 3 of the present disclosure. In this embodiment, the eighth lens L8 has an image-side surface being concave in the paraxial region.

Table 9 and Table 10 show design data of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd vd S1 ∞ d0= −0.997 R1 3.103 d1= 0.943 nd1 1.5444 v1 55.82 R2 5.015 d2= 0.077 R3 4.055 d3= 0.300 nd2 1.6800 v2 18.40 R4 2.897 d4= 0.072 R5 4.320 d5= 0.927 nd3 1.5444 v3 55.82 R6 16.450 d6= 0.119 R7 3.582 d7= 0.320 nd4 1.6800 v4 18.40 R8 3.903 d8= 0.788 R9 8.324 d9= 0.380 nd5 1.6800 v5 18.40 R10 6.851 d10= 1.025 R11 −43.419 d11= 0.500 nd6 1.6800 v6 18.40 R12 −21.624 d12= 0.556 R13 6.513 d13= 0.500 nd7 1.5444 v7 55.82 R14 4.241 d14= 1.097 R15 −8.062 d15= 0.534 nd8 1.5444 v8 55.82 R16 111.320 d16= 0.400 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18= 0.390

Table 10 shows aspherical surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −2.6166E−01  6.4978E−04 −7.9801E−04 1.3781E−03 −9.8088E−04 3.6800E−04 R2  2.8908E+00 −2.9248E−02  4.1125E−03 3.5645E−02 −4.3726E−02 2.4679E−02 R3 −9.9821E+00 −2.7764E−02 −8.1936E−03 4.9389E−02 −5.0012E−02 2.6338E−02 R4 −7.7554E+00  4.1471E−02 −2.4959E−02 −5.0893E−02   8.1730E−02 −5.0199E−02  R5  2.4929E+00  5.1634E−02 −2.1223E−02 −8.0236E−02   1.1348E−01 −6.8032E−02  R6  9.1913E+00  1.8768E−03  7.2859E−03 −1.6534E−02   2.0079E−02 −1.2958E−02  R7 −1.4725E+01 −8.0505E−03 −4.7749E−03 4.9622E−04  6.9263E−03 −6.9916E−03  R8 −1.2781E+01 −2.0542E−02  2.6374E−05 5.4611E−03 −3.0726E−03 4.3198E−04 R9 −6.0929E+00 −2.5040E−02  5.6243E−03 2.0623E−03 −1.5590E−03 4.2451E−04 R10 −2.5173E−01 −2.6022E−02  5.8224E−03 1.1348E−03 −1.1681E−03 4.4852E−04 R11  8.5895E+00 −1.6634E−02 −2.2539E−03 −2.9364E−03   5.9107E−03 −5.4343E−03  R12  9.6786E+00 −1.8030E−02 −1.0347E−03 2.6087E−03 −1.3668E−03 1.6331E−04 R13 −5.7478E+00 −6.4897E−02 −1.4771E−03 6.0941E−03 −1.2217E−03 −1.1362E−03  R14 −7.5718E+00 −4.5939E−02 −3.5813E−03 8.1980E−03 −4.3182E−03 1.2922E−03 R15  4.6612E−01 −1.4398E−02 −4.5280E−03 3.9980E−03 −1.3079E−03 2.5172E−04 R16 −1.0969E+01 −2.3373E−02 −1.1671E−03 2.1189E−03 −6.3037E−04 1.0666E−04 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −2.6166E−01 −7.9956E−05  9.7428E−06 −5.8629E−07  1.2165E−08 R2  2.8908E+00 −7.8657E−03  1.4498E−03 −1.4404E−04  5.9650E−06 R3 −9.9821E+00 −8.1321E−03  1.4768E−03 −1.4589E−04  6.0411E−06 R4 −7.7554E+00  1.6525E−02 −3.0753E−03  3.0518E−04 −1.2570E−05 R5  2.4929E+00  2.2375E−02 −4.2049E−03  4.2458E−04 −1.7925E−05 R6  9.1913E+00  4.6877E−03 −9.5556E−04  1.0221E−04 −4.4538E−06 R7 −1.4725E+01  3.1122E−03 −7.3147E−04  8.8144E−05 −4.2776E−06 R8 −1.2781E+01  1.8036E−04 −8.8318E−05  1.4525E−05 −8.5803E−07 R9 −6.0929E+00 −1.0448E−04  1.9600E−05 −1.7269E−06  0.0000E+00 R10 −2.5173E−01 −1.9802E−04  5.9746E−05 −9.3624E−06  5.8751E−07 R11  8.5895E+00  2.7532E−03 −8.0554E−04  1.2378E−04 −7.5727E−06 R12  9.6786E+00  1.2910E−04 −6.7057E−05  1.2444E−05 −8.0947E−07 R13 −5.7478E+00  8.0985E−04 −2.2798E−04  3.0565E−05 −1.5900E−06 R14 −7.5718E+00 −2.3771E−04  2.6394E−05 −1.6090E−06  4.1159E−08 R15  4.6612E−01 −2.9806E−05  2.1102E−06 −8.1415E−08  1.3122E−09 R16 −1.0969E+01 −1.1638E−05  8.1203E−07 −3.3095E−08  5.9924E−10

Table 11 and Table 12 show design data of inflexion points and arrest points of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 11 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 0 / / P1R2 2 2.105 2.275 P2R1 2 2.095 2.275 P2R2 1 1.965 / P3R1 1 1.985 / P3R2 2 1.815 2.215 P4R1 2 0.995 2.085 P4R2 1 0.885 / P5R1 1 0.815 / P5R2 1 1.085 / P6R1 1 1.955 / P6R2 1 2.005 / P7R1 2 0.445 2.135 P7R2 2 0.605 2.435 P8R1 1 2.765 / P8R2 2 0.185 3.395

TABLE 12 Number(s) of arrest points Arrest point position 1 P1R1 0 / P1R2 0 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 1 2.075 P4R1 1 1.745 P4R2 1 1.655 P5R1 1 1.595 P5R2 1 1.625 P6R1 0 / P6R2 0 / P7R1 1 0.765 P7R2 1 1.095 P8R1 0 / P8R2 1 0.305

FIG. 10 and FIG. 11 show a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 30 in Embodiment 3. FIG. 12 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 30 in Embodiment 3. A field curvature S in FIG. 12 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

Table 13 in the following shows values corresponding to various conditions according to the aforementioned conditions in this embodiment. Apparently, the camera optical lens 30 in this embodiment satisfies the aforementioned conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 30 is 4.712 mm, an image height (IH) of 1.0H is 4.000 mm, and a field of view (FOV) in a diagonal direction is 47.30°. Thus, the camera optical lens 30 meets design requirements for large aperture, long focal length and ultra-thinness. Its on-axis and off-axis chromatic aberrations are sufficiently corrected, thereby achieving excellent optical performance.

TABLE 13 Parameters and Embodiment Embodiment Embodiment conditions 1 2 3 f/TTL 0.98 0.98 0.98 f2/f −3.44 −2.40 −1.83 (R9 + R10)/(R9 − R10) 3.17 29.52 10.30 f 9.000 9.000 9.000 f1 14.952 13.844 12.682 f2 −30.937 −21.599 −16.469 f3 9.885 10.271 10.434 f4 158.867 105.456 44.975 f5 −39.044 −304.593 −62.808 f6 30.433 77.555 61.968 f7 −20.272 −22.880 −24.110 f8 −13.000 −13.038 −13.729 f12 24.259 29.229 35.274 FNO 1.91 1.91 1.91 TTL 9.139 9.140 9.138 IH 4.000 4.000 4.000 FOV 47.50° 47.30° 47.30°

It will be understood by those of ordinary skills in the art that the embodiments described above are specific embodiments realizing the present disclosure. In practice, various changes may be made to these embodiments in form and in detail without departing from the spirit and scope of the disclosure. 

What is claimed is:
 1. A camera optical lens comprising eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies following conditions: 0.95≤f/TTL; −3.50≤f2/f≤−1.80; and 3.00≤(R9+R10)/(R9−R10)≤30.00; where f denotes a focal length of the camera optical lens; TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f2 denotes a focal length of the second lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; and R10 denotes a central curvature radius of an image-side surface of the fifth lens.
 2. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following condition: 1.50≤d10/d9≤3 0.00; where d9 denotes an on-axis thickness of the fifth lens; and d10 denotes an on-axis distance from an image-side surface of the fifth lens to an object-side surface of the sixth lens.
 3. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: 0.70≤f1/f≤2.49; −10.16≤(R1+R2)/(R1−R2)≤−2.83; and 0.05≤d1/TTL≤0.15; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.
 4. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: 3.00≤(R3+R4)/(R3−R4)≤17.99; and 0.02≤d3/TTL≤0.05; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.
 5. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: 0.55≤f3/f≤1.74; −3.42≤(R5+R6)/(R5−R6)≤−0.96; and 0.05≤d5/TTL≤0.19; where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.
 6. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: 2.50≤f4/f≤26.48; −201.36≤(R7+R8)/(R7−R8)≤−15.55; and 0.02≤d7/TTL≤0.05; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.
 7. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: −67.69≤f5/f≤−2.89; and 0.02≤d9/TTL≤0.06; where f5 denotes a focal length of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.
 8. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: 1.69≤f6/f≤12.93; 1.49≤(R11+R12)/(R11−R12)≤9.80; and 0.03≤d11/TTL≤0.08; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.
 9. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: −5.36≤f7/f≤−1.50; 1.81≤(R13+R14)/(R13−R14)≤7.10; and 0.03≤d13/TTL≤0.08; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.
 10. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: −3.05≤f8/f≤−0.96; −2.52≤(R15+R16)/(R15−R16)≤−0.58; and 0.03≤d15/TTL≤0.09; where f8 denotes a focal length of the eighth lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens. 